A detection furnace power gas circuit system and a control method thereof

Abstract

This invention discloses a power gas circuit system and control method for a testing furnace, relating to a testing furnace, including an inlet main pipe, a power gas valve, and a controller; a pressure sensor is installed on the inlet main pipe, and the inlet main pipe is connected to the inlet port of the power gas valve through a three-way connector; the third connector of the three-way connector is connected to one end of the combustion furnace coil through a branch pipe; a solenoid valve is installed in the branch pipe; one port of the power gas valve is connected to port B of the cylinder through a branch pipe; the other port of the power gas valve is connected to two interconnected branch pipes, a pressure regulating valve is installed on the branch pipe; the other ends of the branch pipes are connected to a solenoid valve, which is connected to port A of the cylinder through a branch pipe; a pressure sensor is installed in the branch pipe. This invention solves the problems of separate two gas sources, complex piping, and large space occupation in traditional solutions.

Description

Technical Field

[0001] This invention relates to a testing furnace, and more specifically, to a power gas path system for a testing furnace and its control method. Background Technology

[0002] A chemical element analysis furnace is a specialized high-temperature furnace used to burn samples, releasing carbon, sulfur, oxygen, nitrogen, and hydrogen as gases. The combustion process is typically executed by a combustion coil, which is usually a hollow, spiral-shaped copper tube. During operation, if the copper tube overheats, gas is introduced to cool it and prevent burnout. Similarly, after burning, other gases can be introduced to cool both the copper tube and the sample. However, existing furnace piping systems often separate the combustion gas path from the power gas path of the actuator (such as a cylinder used to lift the crucible containing the sample). While this ensures that the two gas paths do not interfere with each other, it also leads to numerous problems such as complex system structure, large space occupation, and inconvenient installation, maintenance, and debugging. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a detection furnace power gas circuit system and its control method to address the shortcomings of the existing technology. This solves the problems of separation of two gas sources, complex pipelines, and large space occupation in the traditional solution, and realizes the simplification of system structure and minimization of space occupation.

[0004] The present invention discloses a detection furnace power gas circuit system, comprising an inlet main pipe, a power gas valve, and a controller; a pressure sensor is installed on the inlet main pipe; the inlet main pipe is connected to the inlet port of the power gas valve via a three-way connector; the third connector of the three-way connector is connected to one end of the combustion furnace coil via a branch pipe; a solenoid valve is installed in the branch pipe; one port of the power gas valve is connected to port B of the cylinder via a branch pipe; the other port of the power gas valve is connected to two interconnected branch pipes, a pressure stabilizing valve is installed on the branch pipe; the other ends of the branch pipes are connected to a solenoid valve; the solenoid valve is connected to port A of the cylinder via a branch pipe; a pressure sensor is installed in the branch pipe; and the controller is electrically connected to the pressure sensor, the pressure sensor, the solenoid valve, and the solenoid valve.

[0005] Preferably, a silencer is installed on the exhaust port of the power valve.

[0006] Preferably, the power valve is a two-position four-way solenoid valve.

[0007] Preferably, the other end of the combustion furnace coil is connected to a silencer via a branch pipe.

[0008] Preferably, a second tee connector is installed on the intake manifold, and the first pressure sensor is a pressure gauge, which is connected to the third connector of the second tee connector via a connecting pipe.

[0009] A control method based on the aforementioned detection furnace power gas circuit system, the method comprising: Reset the power gas circuit system of the detection furnace to its initial state so that the solenoid valve one is closed and the power gas valve is connected to the cylinder A port through branch pipe three and branch pipe six; High-pressure gas is introduced into the intake manifold to extend the piston rod of the cylinder to its maximum length. Simultaneously, the controller monitors the real-time temperature of the combustion furnace coil via a temperature sensor. When the real-time temperature exceeds a set safe temperature threshold, the first solenoid valve is activated. Pressure data from pressure sensors one and two are simultaneously collected, and the cylinder-side pressure for the next sampling cycle is predicted based on this pressure data. The operating state of the first solenoid valve is then controlled based on the cylinder-side pressure of the next sampling cycle and the preset safe pressure threshold. If the cylinder-side pressure in the next sampling period is less than or equal to a preset safe pressure threshold, then the first solenoid valve is closed until the pressure data collected by the second pressure sensor is the preset maximum cylinder-side pressure threshold, and at the same time, permission to allow the first solenoid valve to open is granted.

[0010] Preferably, the cylinder-side pressure in the next sampling cycle is calculated using the following formula: , In the formula, P c,t+1 To predict the cylinder-side pressure in the next sampling period; P c,t The current pressure data collected by pressure sensor two; P g,t The current pressure data collected by pressure sensor 1; P g,t-1 is the pressure data collected by the pressure sensor in the previous sampling period; k is the pipe loss coefficient.

[0011] Beneficial effects The advantages of this invention are: 1. This invention draws the combustion purging gas path and the actuator drive gas path from the same gas source interface and integrates them in a high degree, sharing the valve body and pipeline. This solves the problems of separate gas sources, complex pipelines, and large space occupation in traditional solutions, and simplifies the system structure and minimizes space occupation.

[0012] 2. This invention introduces a closed-loop control logic that combines temperature monitoring and pressure feedforward prediction, thereby achieving the goal of simultaneously ensuring the cooling performance of the combustion furnace coil and the stability of the cylinder, significantly improving the operational safety and reliability of the detection furnace power gas circuit system under complex thermal environments. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the side structure of the testing furnace (with concealed furnace door) of the present invention; Figure 2 This is a schematic diagram of the power gas path system for the detection furnace of the present invention.

[0014] The components are: 1. Cylinder; 2. Combustion furnace coil; 3. Crucible; 4. Main intake pipe; 5. Power valve; 6. Solenoid valve one; 7. Pressure regulator valve; 8. Solenoid valve two; 9. Silencer one; 10. Silencer two; 11. Pressure gauge; 12. Branch pipe one; 13. Branch pipe two; 14. Branch pipe three; 15. Branch pipe four; 16. Branch pipe five; 17. Branch pipe six; 18. Branch pipe seven. Detailed Implementation

[0015] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention. See Figures 1-2 This invention discloses a detection furnace power gas circuit system, comprising an intake manifold 4, a power gas valve 5, and a controller. A pressure sensor is installed on the intake manifold 4. The intake manifold 4 is connected to the intake port of the power gas valve 5 via a tee connector. The third connector of the tee connector is connected to one end of the combustion furnace coil 2 via a branch pipe 12, in which a solenoid valve 6 is installed. The other port of the power gas valve 5 is connected to interconnected branch pipes 14 and 15. Specifically, branch pipes 14 and 15 are connected to the port of the power gas valve 5 via a tee connector and a branch pipe 16. A pressure regulating valve 7 is installed on branch pipe 14. The other ends of branch pipes 14 and 15 are connected via a solenoid valve 8. The solenoid valve 8 is connected to port A of cylinder 1 via a branch pipe 17, in which a pressure sensor is installed. The controller is electrically connected to pressure sensor 1, pressure sensor 2, solenoid valve 1 (6), and solenoid valve 2 (8).

[0016] When the testing furnace power gas system is running, the single power gas source, such as compressed air, introduced from the main intake pipe 4 is split into two paths at a three-way connector. One path supplies the combustion furnace coil 2 through branch pipe 12 under the control of solenoid valve 6 to complete processes such as purging and cooling; the other path directly enters the intake port of the power gas valve 5 to provide power to the drive cylinder 1. The power gas valve 5 selectively supplies or exhausts air to the corresponding port of cylinder 1 through branch pipe 2 13 or a dual-control pipeline composed of branch pipe 3 14 and branch pipe 4 15, thereby controlling the extension or retraction of the piston rod of cylinder 1 to raise or lower the crucible 3, allowing it to rise into the combustion furnace coil 2 or descend out of the combustion furnace coil 2. This structure draws the combustion purging gas path and the actuator drive gas path from the same gas source port and highly integrates them, sharing the valve body and pipelines. It solves the problems of separate two gas sources, complex pipelines, and large space occupation in traditional solutions, achieving simplification of system structure and minimization of space occupation.

[0017] Specifically, the aforementioned dual-control pipeline, comprising branch pipe 5 (16), tee connector 3, branch pipe 3 (14) with pressure regulating valve 7, branch pipe 4 (15), solenoid valve 2 (8), and branch pipe 6 (17), together constitutes an integrated control branch with secondary flow stabilization and on / off control functions, in addition to the power air valve 5. When the power air valve 5 switches to supply air to cylinder 1 through the dual-control pipeline, the airflow, after being divided into three streams via branch pipe 5 (16) and tee connector 3, mainly flows to solenoid valve 2 (8) through branch pipe 3 (14) equipped with pressure regulating valve 7. During this process, pressure regulating valve 7 smooths out pressure fluctuations in the airflow, playing a buffering and stabilizing role. When solenoid valve 2 (8) is energized and turned on, the pressure-stabilized airflow smoothly enters the corresponding cavity of cylinder 1 through branch pipe 6 (17), driving the piston to move smoothly and effectively avoiding "creeping" or impact phenomena caused by sudden changes in air pressure. Similarly, when the cavity of cylinder 1 needs to be vented, solenoid valve 28 can be switched so that the exhaust from cylinder 1 passes through solenoid valve 28, branch pipe 4 15, and the exhaust port of power valve 5, ensuring that cylinder 1 returns quickly. This design, which uses parallel branch pipes and connects pressure stabilizing valve 7 in series with one of the branch pipes, achieves both pressure stabilization and buffering of air supply and rapid and smooth exhaust through the arrangement of pipelines and valves, without adding additional large-volume buffer tanks or other complex components. This optimizes the kinematic characteristics of cylinder 1 and meets the different action requirements of the cylinder during the use of the testing furnace. Moreover, the design of pressure stabilizing valve 7 is beneficial for ensuring the stability of the cylinder side air pressure when the main air inlet pipe 4 supplies air to both the combustion furnace coil 2 and cylinder 1.

[0018] In this embodiment, a muffler 2 10 is installed on the exhaust port of the power valve 5. The muffler 2 10 is directly installed at the exhaust port. When the gas in the cylinder 1 cavity flows back through the dual control pipeline or branch pipe 2 13 and is discharged from the exhaust port, the high-speed airflow passes through the porous sound-absorbing material or tortuous flow channel inside the muffler 2 10, and its kinetic energy is dissipated, thereby significantly reducing the exhaust whistling noise and improving the working environment.

[0019] In this embodiment, the power valve 5 is a two-position four-way solenoid valve. By selecting a two-position four-way solenoid valve as the power valve 5, the valve core is switched between two working positions through electrical signal control. This can reliably realize the change of the passage between one intake port, two working ports connected to branch pipe 2 13 and the dual control pipeline respectively, and one exhaust port, thereby accurately controlling the bidirectional extension and retraction movement of cylinder 1.

[0020] In this embodiment, the other end of the combustion furnace coil 2 is connected to a silencer 9 via a branch pipe 7 18. When the solenoid valve 6 is opened, the airflow distributed from the intake manifold 4 to the branch pipe 12 purges the combustion furnace coil 2. The exhaust gas carrying heat is then discharged into the atmosphere via the silencer 9 at the end of the branch pipe 7 18 connected to the outlet end of the combustion furnace coil 2. The silencer 9 effectively suppresses the noise of the exhaust gas from the combustion furnace coil 2, achieving multi-point noise reduction in the system.

[0021] In this embodiment, a two-way connector is installed on the main air inlet pipe 4, and the pressure sensor is a pressure gauge, which is connected to the third connector of the two-way connector via a connecting pipe. Operators or the control system can read the pressure value of the main air source in real time and intuitively, facilitating monitoring of the air source status, timely detection of abnormal air source pressure, and ensuring safe operation of the system within the set pressure range. For example, during the operation of the testing furnace, if the air pressure displayed on pressure gauge 11 is between 4 and 6 bar, it indicates that the air supply is normal.

[0022] The present invention also provides a control method based on the above-mentioned detection furnace power gas circuit system, the method being: When the system is started, the power gas circuit system of the detection furnace is first reset to the initial state so that the solenoid valve 6 is closed and the power gas valve 5 is connected to the A port of cylinder 1 through branch pipe 3 14 and branch pipe 6 17.

[0023] Next, high-pressure gas is introduced into the intake manifold 4 to extend the piston rod of cylinder 1 to its maximum length. Simultaneously, the controller monitors the real-time temperature of the combustion furnace coil via a temperature sensor. When the real-time temperature exceeds a set safe temperature threshold, the solenoid valve 6 is opened. Pressure data from pressure sensors 1 and 2 are simultaneously collected, and the cylinder-side pressure for the next sampling cycle is predicted based on this pressure data. The cylinder-side pressure for the next sampling cycle is calculated using the following formula: .

[0024] In the formula, P c,t+1 To predict the cylinder-side pressure in the next sampling period; P c,t The current pressure data collected by pressure sensor two; P g,t The current pressure data collected by pressure sensor 1; P g,t-1 represents the pressure data collected by the pressure sensor in the previous sampling period; k is the pipe loss coefficient, a dimensionless constant with a value range of [0.8, 0.95], obtained through experimental calibration. In this formula, It can be considered a prediction of the intake manifold side pressure.

[0025] Then, the working state of the solenoid valve 6 is controlled according to the predicted cylinder side pressure of the next sampling cycle and the preset safety pressure threshold: If the cylinder-side pressure predicted for the next sampling period is less than or equal to a preset safe pressure threshold, then the solenoid valve 6 is closed until the pressure data collected by the pressure sensor is equal to the preset maximum cylinder-side pressure threshold, and at the same time, permission to open the solenoid valve 6 is granted.

[0026] In this control method, a closed-loop control logic combining temperature monitoring and pressure feedforward prediction is introduced: when the system starts and drives cylinder 1 to extend, the controller continuously monitors the temperature of the combustion furnace coil 2; once the temperature exceeds the safety threshold, it indicates that the combustion furnace coil is at risk of overheating, and gas cooling needs to be intervened. At this time, the system does not simply cut off the gas source or stop the operation, but opens solenoid valve 6 and collects pressure data from the cylinder side and the intake manifold 4 in real time. It uses this data to predict the pressure trend of the cylinder side at the next moment. That is, if the predicted pressure is not lower than the safety pressure threshold, solenoid valve 6 continues to be opened, thereby achieving the goal of simultaneously taking into account the cooling of the combustion furnace coil 2 and the stability of cylinder 1, significantly improving the operational safety and reliability of the detection furnace power gas circuit system in complex thermal environments.

[0027] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A furnace power gas path system characterized by, It includes an intake manifold (4), a power valve (5), and a controller; a pressure sensor is installed on the intake manifold (4), and the intake manifold (4) is connected to the intake port of the power valve (5) through a three-way connector. The third connector of the three-way connector is connected to one end of the combustion furnace coil (2) through a branch pipe (12). A solenoid valve (6) is installed in the branch pipe (12); one port of the power valve (5) is connected to the B port of the cylinder (1) through a branch pipe (13). Another interface of the controller is connected to the interconnected branch pipe three (14) and branch pipe four (15). A pressure stabilizing valve (7) is installed on the branch pipe three (14). The other ends of the branch pipe three (14) and branch pipe four (15) are connected through solenoid valve two (8). Solenoid valve two (8) is connected to port A of cylinder (1) through branch pipe six (17). Pressure sensor two is installed in branch pipe six (17). The controller is electrically connected to pressure sensor one, pressure sensor two, solenoid valve one (6) and solenoid valve two (8).

2. The detection furnace power gas path system according to claim 1, characterized by, A silencer (10) is installed on the outlet of the power valve (5).

3. The detection furnace power gas path system according to claim 2, wherein, The power valve (5) is a two-position four-way solenoid valve.

4. The detection furnace power gas path system according to claim 1, characterized by, The other end of the combustion furnace coil (2) is connected to a silencer (9) via a branch pipe (13).

5. The detection furnace power gas path system according to claim 1, characterized by, The intake manifold (4) is equipped with a two-way connector, and the pressure sensor is a pressure gauge (11), which is connected to the third connector of the two-way connector through a connecting pipe.

6. A control method for a detection furnace power gas passage system according to any one of claims 1 to 5, characterized by, The method is as follows: Reset the power gas circuit system of the detection furnace to the initial state so that the solenoid valve one (6) is closed and the power gas valve (5) is connected to the A port of the cylinder (1) through the branch pipe three (14) and the branch pipe six (17); High-pressure gas is introduced into the intake manifold (4) to extend the piston rod of the cylinder (1) to its maximum length. At the same time, the controller monitors the real-time temperature of the combustion furnace coil through a temperature sensor. When the real-time temperature is greater than the set safe temperature threshold, the solenoid valve one (6) is opened. At the same time, the pressure data output by pressure sensor one and pressure sensor two are collected, and the cylinder side pressure of the next sampling cycle is predicted based on the pressure data. The working state of the solenoid valve one (6) is controlled according to the cylinder side pressure of the next sampling cycle and the preset safe pressure threshold. If the cylinder-side pressure in the next sampling period is less than or equal to the preset safe pressure threshold, the solenoid valve 1 (6) is closed until the pressure data collected by the pressure sensor 2 is the preset maximum cylinder-side pressure threshold, and at the same time the permission to allow the solenoid valve 1 (6) to open is granted.

7. A control method, characterized in that, The cylinder-side pressure for the next sampling cycle is calculated using the following formula: ， wherein P c,t+1 is the cylinder-side pressure of the next sampling period; P c,t is the current pressure data collected by the pressure sensor two; P g,t is the current pressure data collected by the pressure sensor one; P g,t-1 is the pressure data of the previous sampling period collected by the pressure sensor one; and k is the pipe loss coefficient.

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